THE COURSE OF DISTILLATION CURVES IN TERN ARY-SYSTEMS

In the article the possibilities of the calculation of distillation cu rves are discussed on the basis of empirical thermodynamic models for activity coeficients. A set of all possible variants of distillation c urves in ternary mixtures is also presented. These ternary mixtures ar e classified on the basis of the number and the type of binary azeotro pic points. The set of the diagrams presented represents a very useful tool in the selection of the strategy of separation of individual com ponents by distillation and in the checking of the existence or non-ex istence of ternary azeotropic points. The course of the distillation c urves should also serve as a guide in the experimental determination o f liquid-vapour equilibria in ternary mixtures, especially in the sele ction of the composition of ternary mixtures. It is advisable to inves tigate particularly the concentration region lying in the proximity of the destilation curve. In the some region the thermodynamic descripti on should be thoroughly checked.